Tank issues..

[Magma]

noticed yesterday some acans i had didnt seem as big as they were a few days ago, and today i noticed they still seemed smaller, also my GBTA has retracted into the rock hes on and hes hardly even seen yet just yesterday hes been open and happy. Also the protein skimmer died today so its been off for about 3 hours..

SG 1.025
ph-8.4
Ammonia-0
Nitrite-0
Nitrate-0-5ppm
Temp 78

tank is a 40gal with 2 black clowns and royal gramma how long do think i can run this without a skimmer?